X’s are everywhere in user interface (UI) design. A powerful symbol, [x] is capable of closing windows and popups, toolbars and tabs and anything else that might otherwise be cluttering up your screen. Twitter XClicking on [x] to close a feature has become an instinctual part of using a computer and a standard in web and software design. Although it may seem like the ubiquitous [x] has always been
![X to Close](https://cdn-ak-scissors.b.st-hatena.com/image/square/28cdd6835e7178252ee73edab375bb6c7fb601b6/height=288;version=1;width=512/https%3A%2F%2Fmiro.medium.com%2Fv2%2Fresize%3Afit%3A552%2F1%2AvD_yp7OjKU8l7BkCKDsbOg.png)